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s in (-oo:+oo)
2/5 = s/12 // - s/12
2/5-(s/12) = 0
2/5-1/12*s = 0 // - 2/5
-1/12*s = -2/5 // : -1/12
s = -2/5/(-1/12)
s = 24/5
s = 24/5
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